Electric lighting device



y 1938- H. A. DOUGLAS 2,117,758

ELECTRIC LIGHTING DEVICE Filed. April 4, 1936 9 Shets-Sheet l Hen-1'13 A. Douglas INVIJNTOR x? JMW Z/W ATTOR NEYS May 17, 1938. H. A. DOUGLAS 2,117,758

ELECTRIC LIGHTING DEVICE Filed April 4, 1936 9 SheetsSheet 2 H0413 A- D -5 INVENTOR ATTORNEYS May 17, 1938. DOUGLAS 2,117,758

ELECTRIC LIGHTING DEVICE Filed April 4, 1936 9 Sheets-Sheet 3 Haws A.

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ATTOR NEfS y 1938- H. A. DOUGLAS 2,117,758

ELECTRIC LIGHTING DEVICE Filed April 4, 1936 9 Sheets-Sheet 4 Hans A- "D ugl luvzNToR YZ MWJMMWW y 1933- H. A. DOUGLAS 2,117,758

ELECTRIC LIGHTING DEVICE Filed April 4, 1936 9 Shets-Sheet 5- III I llllllll Douglas luvzvrro ATTORNEYS Hart-5 A.

m 17, 1938. H. A. OUGLAS 2,117,758

ELECTRIC LIGHTING DEVICE Filed April 4, 1936 9 Sheets-Sheet 6 1 41 161 .A. Dov. as

170 Harts iR wawmw May 17, 1938. H. A. DOUGLAS 2,117,758

ELECTRIC LIGHTING DEVICE Filed April 4, 1936" 9 SheetS-She et 7 3 INVzNTOK YLWJ MWZ/W ATTORNEYS May 17, 1938. H. A. DOUGLA 2,117,758

V ELECTR IC LIGHTING DEVICE Filed April 4, 1956 9 Sheets-Sheet 8 Don has Invz NTOR ATTORNEYI:

y 1938. H. A. DOUGLAS 2,117,758

ELECTRIC LIGHTING DEVICE I Filed April 4, 1936 9 She ets-Sheet 9 Huh-'3 A. Dec: 1a.!

INVLN 0 YZMAMM MW ATTORNEYS Patented May 17, 1938 UNITED STATES PATENT OFFICE 2,117,768 I ELECTRIC LIGHTING DEVICE of Indiana Application April 4, 1936, Serial No. 72,775

9 Claims.

My invention relates to electric lighting devices, and more particularly to electric lamp units comprising an incandescent electric lamp mounted in a reflector, as for example, in an automobile headlight, and the principal object of my invention is toprovide a new and improved lighting device and unit of this type.

In the drawings accompanying this specification, and forming part of this application, I have shown, for purposes of illustration several forms which my invention may assume. In these drawings:

Figure 1 is a vertical sectional view, certain parts being fragmentarily shown, of one embodiment of my invention,

Figure 2 is a plan view of some of the parts, shown in Figure 1, before they are completely assembled,

Figure 3 is a fragmentary developmental detall view, on a smaller scale,

Figure 4 is a front elevation of a holding means or socket unit, forming part of the embodiment shown in Figure 1, 1

Figure 5 is a side elevation of the holding means shown in Figure 4,

Figure 6 is a section taken along the line 6-6 of Figure '7, looking in the direction of the arrows.

Figure 7 is a side elevation of a lamp and holding means, assembled, the lamp being fragmentarily shown,

Figure 8 is a sectional view of a lamp, taken on the line 6-6 of Figure 7, the holding means shown in the latter figure being omitted,

Figure 9 is a fragmentary rear elevation of a mounting, or reflector, which is used in the embodiment of Figure 1,

Figure 10 is a section taken on the line Ill-ll) of Figure 1, looking in the direction of the arrows,

Figure 11 is a fragmentary sectional view taken on the line H-Il of Figure 10, looking in the direction of the arrows,

Figure 12 is a fragmentary sectional view taken on the line IZ-l2 of Figure 10, looking in the direction of the arrows,

' Figure 13 is a vertical sectional view, certain parts being fragmentarily shown, of another embodiment of my invention,

Figure 14 is a front elevation of a holding means or socket unit forming part of the embodiment shown in Figure 13,

Figure 15 is a side elevation of the holding a means shown in Figure 14,

Figure 16 is a front elevation of a detail part of the embodiment of Figure 13,

Figure '17 is a front elevation, partly in transverse section, of the electric lamp forming part of the embodiment of Figure 13,

Figure 18 is a section taken along the line l8-l8 of Figure 19, looking in the direction of the arrows,

Figure 19 is a side elevation of a lamp and holding means, assembled, the lamp being frag- 10 mentarily shown,

Figure 20 is a fragmentary front elevation of a mounting or reflector forming part of the embodiment in Figure 13,

Figure 21 is a section taken along the line 15 2I-2l of Figure 13, looking in the direction of the arrows,

Figure 22 is a perspective rear view of the mounting or reflector of the embodiment of Figure 13,

Figure 23 is a fragmentary sectional view taken along the line 23-23 of Figure 21,

Figure 24 is a side elevation, on a larger scale, of a detail forming part of the embodiment of Figure 13, before assembly in that embodiment, 25

Figure 25 is a vertical sectional view, certain parts being fragmentarily shown, of another embodiment of my invention,

Figure 26 is a front elevation of a detail forming part of the embodiment of Figure 25,

Figure 27 is a developmental view of a detail forming part of the embodiment of Figure 25, on a smaller scale,

Figure 28 is a front elevation of a holding means or socket unit forming part of the embodiment of Figure 25,

Figure 29 is a side elevation of the holding means shown in Figure 28,

Figure 30 is a sectional view taken along the line 30-30 of Figure 31, looking in the direction of the arrows, 40

Figure 31 is a side elevation of a lamp and holding means, assembled, the lamp being fragmentarily shown,

Figure 32 is a fragmentary front elevation of a mounting or reflector forming part of the embodiment of Figure 25,

Figure 33 is a. section taken along the line 33-33 of Figure 25, looking in the direction of the arrows, 50

Figure 34 is a fragmentary sectional view taken along the line 34-34 of Figure 33, on an enlarged scale,

Figure 35 is a side elevation, on an enlarged scale, of a detail forming part or the embodiment of Figure 25, before assembly in that embodiment,

Figure 36 is a vertical sectional view, certain parts being fragmentarily shown, of another embodiment of my invention,

Figure 37 is a side elevation, partly fragmentary, of a lamp and holding means, used in Figure 36, assembled,

Figure 38 is a front elevation of the holding means used in Figure 36,

Figure 39 is a vertical sectional view, certain parts being fragmentarily shown, of another embodiment of my invention,

Figure 40 is a side elevation, partly fragmentary, of a lamp and holding means, used in Figure 39, assembled,

Figure 41 is a front elevation of the holding means used in Figure 39,

Figure 42 is a vertical sectional view, certain parts being fragmentarily shown, of another embodiment of my invention,

Figure 43 is a side elevation, partly fragmentary, of a lamp and holding means, used in Figure 42, assembled,

Figure 44 is a front elevation of the holding means used in Figure 42,

Figure 45 is a section taken on the line 4545 of Figure 42, looking in the direction of the arrows,

Figure 46 is a fragmentary section taken on the line 46-46 of Figure 45, looking in the direction of the arrows,

Figure 4'7 is a vertical sectional view, certain parts being fragmentarily shown, of another embodiment of my invention,

Figure 48 is a side elevation, partly fragmentary, of a lamp and holding means, used in Figure 47, assembled,

Figure 49 is a front elevation of the holding means used in Figure 47,

Figure 50 is a front elevation, partly in transverse section, of the lamp used in Figure 4'7,

Figure 51 is a section taken on the line 5l5l of Figure 47, looking in the direction of the arrows, and

Figure 52 is a fragmentary section taken on the line 52-52 of Figure 51, looking in the direction of the arrows.

Referring to Figure 1, the embodiment of my invention here illustrated is shown as including an incandescent electric lamp 40, adapted to be suitably connected to a mounting 4|, the mounting being in this instance a reflector fragmen- .tarily shown. The lamp 40 is provided with a base 42, which in this instance includes laterally extending positioning means 43 also forming part of the means for connecting the lamp to the reflector. The base 42 includes a shell 44, and the laterally extending portion of the base comprises a collar 45 surrounding the shell 44, and a radially extending flange 46 on the collar. The collar 45 may be fastened to the base 42 in any suitable manner, as by solder 41 (see Figure 8). The lamp flange 46 is adapted to be seated on the bottom of a rearwardly extending pocket 48 provided on the reflector 4|, and a holding means 49, cooperating with the lamp flange 46, is provided for holding the lamp 40 assembled with the holding means 49 and with the reflector 4 I, as will more fully appear. By the term rearwardly, or rear, is meant in a direction away from the light source of the lamp 40, frontwardly, and front, of course, having the opposite significance.

The holding means comprises a shell 59, desirably of generally cylindrical form, which may be 'sulating member 66.

seamless and formed of sheet metal. The shell 50 is in this instance provided with a plurality of integral connector portions 5|, 52, 53, unequally spaced circumferentially, extending in a direc tion generally parallel to the axis of the holding means 49. Each of the connector portions 5|, 52, 53 is similarly formed and therefore a detailed description of one of them will serve for all. The connector portion 52, for example, comprises an axially extending bar 54 here shown as having parallel edges, the bar merging with a hook, the throat 55 of which is narrower than the circumferential width of the bar 54. The upper margin,

56, as viewed in Figure 2, of the throat 55 of the hook, where it merges with the bar 54, forms an axial extension of the upper margin of the bar, whereas the lower margin, 51, of the throat of the hook intersects a shoulder 58 formed at the end of the bar, the throat 55 of the hook being narrower than the bar 54. The hook has a mouth, the bottom sides of which are defined by converging lines 59, 60, forming a generally V- shaped recess, the bottom of which may be rounded off, as indicated. The end of the throat portion 55 of the hook may be beveled oil, forming a beveled margin 6i. The outer edge of the lip of the hook is defined by an axial line 62, and that portion of the lip of the hook merging with the inside of the mouth of the hook may be beveled off, to form a beveled edge 63, so that the apex 83 of the lip is formed by the lines 59, 63. The free end of the hook is defined by a line 64, in a plane transverse to the axis of the holding means 49. The chin of the hook may also be beveled, to form a beveled margin 65.

The holding means 49 serves also to carry an insulating member 66, an outside diameter of which is approximately equal to the inside diameter of the shell 50, adapted to abut diametrically opposite segmental flanges 61, 68 extending radially inwardly from the rear end of the shell 50. The insulating member 66 is further provided with a plurality of circumferentially spaced radial projections, in this instance three, two of which 69, 10, may be seen in Figure 5, for example, and a third of which, H, is located at the other side of the member 66, analogously to the projection 10. On opposite circumferential sides of the projection 69 are disposed two rearwardly extending projections 12, 13 on the shell 5!]. Immediately below the projections 10, II, as viewed in Figure 5, the shell 50 is provided with the respective rearward projections l4, 15. The space between the projections l4, 15 is less than the space between the projections I2, 13. The

projections 12, I3, l4, l5, and the projections 69, 10, H may be arranged in any other suitable manner, so that the insulating member 66 and the shell 50 may be assembled in but one relative rotative relation. In order to hold the insulating member 66 to the shell 59, the projections 12, I3, l4, 15 are provided with fingers 16, which may be clinched radially inwardly over the rear face of the insulating member 66.

The insulating member 66 is adapted to carry contacts l1, 18, these contacts being desirably formed as enlarged heads on shanks fitted over and swedged to the ends of conductors I9, respectively. The conductors I9, 80 are disposed in sleeves 8|, the sleeves being slidable within bushings 92, which are fixedly mounted, in any suitable manner, as by beading, throughthe in- Springs 84 surround the sleeves 6i between the bushings and flanges 85,

III

on the front ends of the sleeves, abutting, the contacts 11, is. e I

The contacts TI 18, are adapted ,to make 0011-. tact respectively with a pair of contacts 86, 81 on the base of the incandescent lamp 49. The contact'86, directly'behind the contact 81 in Figure 1, is the. contact which engages the spring pressed contact 17, visible in that figure. The provision of the plurality of contacts on the lamp base en- I ables the use of a multiple filament lamp, the lamp being here shownas provided with two filaments 88, 89, one ol'which, 88, may desirably have its lighting center at some predetermined point with respect to thereflector, as for example the focus, and the other of which, 89, may be displaced from the filament 99 and may be used for providing dim light or so-called tilted light. The filaments 88, 89 have their terminals connected in a well known manner to the lamp base 42 and to the contacts 99, 81 on the lamp base. The

passage of current to either one or both of the -filaments 88, 99 may be controlled in any suitable manner by switching means (not shown) interposed in the conductors 19, 89.

The holding means 49 also includes a biasing means 99, in this instance comprising a ring 9| of sheet metal, provided with portions, circumferentially unequally spaced, extending in a generally radial direction outwardly from the ring, and looped or bent radially inwardly so as to form the spring loops 92, 93, 94. The free ends of the spring loops may be reduced in width, to form tongues 95, adapted to be received respectively in a plurality of recesses 99 which may be formed in the front margin of the shell 59. The recesses 96 are unequally spaced circumferentially to accommodate the unequal spacing of the spring loops 92, 93, 94. The spring loops 92, 94 are spaced less than 120 apart, and these loops are here shown as of the same width but each is narrower than the spring loop93.

The ring 9| has a central aperture 91 of approximately the same diameter as the circle defined by the inner peripheries of the connector portions 52, 53. The aperture 91 is] provided with a plurality of compound auxiliary apertures or recesses, which form radial extensions of the central aperture 91. These compound apertures are circumierentially unequally spaced, and as they are identical, but one of them will be specifically described. Each compound aperture comprises a narrow or seat portion 98 having radial margins spaced circumferentially a distance slightly greater than the throat 55 of one of the hooks of the connector portions 5|, 52, 53.

Each compound aperture further comprises a wider or entrance portion 99 having a radially outer circumferential margin which may if desired be narrower circumferentially than the distance between the longitudinal margins 51, 62 of one of the hoks. The seat portion 98 and the entrance portion 99 are separated by a cam surface I99, extending from the clockwise margin of the seat portion 98 to the radially outer cirr cumferential margin of the entrance portion 99.

It will be evident that the hooks of the connector portion 5|, 52, 53 may be inserted in an axial direction through the entrance portions 99 of ihe compound apertures of the ring9l, until engag ethe cams I99, thereby causing the hooks tobe moved radially, inwardly, theconnector portions5I, 52, 53 beingresilient enough for that purpose. Further rotation in a counterclockwise. direction will bring the-trailing edges of the throats 55 of the hooks beyond thecrests oi the cams I99, whereupon the hooks will snap radially outwardly into the seat portions 98, to the position shown in Figure 4. The spring loops 92, 93, 94'

may then, be flexed and thetongues 95 inserted in the recesses 99. ,Theassembled holding means,

.apexes by the action of the springloops 92, 93, 94.

The lamp flange 45 comprises a portion I9I, of generally circular outline, and aiplurality of radially extending sectoral, projections, desirably three, I92, I93, I94. The peripheral arcs of the sectoral projections are here shown as equal, but the projections are circumferentially unequally spaced, the lower projections, I92, I94, as viewed in the drawings, being less than 129 apart, and the upper projection, I93, being so positioned that its axis of symmetry bisects the angle between the axes of symmetry of the lower projections, I92, I94. Each sectoral projection I92, I93, I94 is here shown as being providedawith an axially rearwardly extending projection I95, conveniently formed by forming a depression I96 in the front face of the sectoral projection.

For cooperation with the hooks of the connector portions 5|, 52, 53, the lamp flange 46 is provided with a plurality of compound apertures I91, I98,

I99, adapted to receive the hooks. Each compound aperture comprises a set of two apertures, and since all of the apertures are identical, but one of them will be described. The aperture I98, for example, comprises a larger portion H9 and a smaller portion III, these portions in this instance being separate from each other. Both the larger aperture H9 and the smaller aperture III have a radially outer circumferential edge and a radially inner circumferential edge, defined by arcs concentric with the lamp base 42, and of the same or substantially the same radius of curvature as the outer andinner peripheries of the books of the connector portions 5I, 52, 53. The circumferential ends of the larger aperture are defined by radial lines H2, H3, while the circumferential ends of the smaller aperture II I are defined by radial lines H4, H5. The adjacent lines H3, H4 form between them a generally radially extending portion IIG which is of such circumferential width as to be receivable in the bottom 59,59 of the mouth of the hook of the connector portion 52, for example. edges I I3, I I4 are adapted to engage the V-shaped recess formed by the edges 59, 69 of the bottom of the mouth of the hook of the connector 52. The compound apertures I91, I 99, in a manncrdescribed in connection with the aperture I98, also form radially extending portions II6 adapted to cooperate with the hooks of the connector portions 5|, 53, in a manner similar to that described in connection with the radially extending portion IIG, left by the compound aperture I98, and the hook of the connector portion 52. The radially extending portions I I9 are desirably so positioned that they are in radial alinement with the axial projections I95 respectively andof course are circumferentially unequally spaced to accord with the spacing of the hooksof the connector portions 5|, 52, 53;

Thus, the

The lower recess, I20, as viewed in Figure 9, for

example, is slightly wider circumferentially than one of thesectoral projections I02, I03, I04 of the lamp flange 46, and the end flanges I23, I26 are of substantially the same circumferential width as the sectoral projections I 02, I04. How'- ever, the end flange I24 is somewhat wider than the fianges I 23, I 25, and also is somewhat'wider than the space between: the sectoral projections I02, I04. Furthermore, the end flanges I23, I24, I25 are so positioned that in one relative rotative relation as between the lamp 40 and the re-' flector 4|, the axes of symmetry of the sectoral projections I02, I03, I04 on the lamp flange 46 will register with the axes of symmetry of the end flanges I23, I24, I25. The diameter of the inner periphery of the cylindrical portion II1 of v the holding means 49 is as follows.

the pocket 48 is here shown as slightly larger than the diameter of thecircle defining the outer peripheries of the sectoral projections I02, I03, I04 of the lamp flange, but thecylindrical portion of the pocket may gage, that is, snugly flt the outer peripheries of the sectoral projections, when the axial projections I05 are seated on the end flanges I23, I24, I25.

The plane of the rear faces of the end flanges I23, I24, I25 is in the same plane .as the flangeless portions of the rear end of the cylindrical portion Ill, the end flanges I23, I24, I25 are shown as each provided, on their rear faces, with a pair of parallel, generally radially extending ridges I 26. The sides of the ridges desirably serve as cam surfaces. The space between the respective pairs of ridges I26 and the space between the ridges of a given pair, are so selected that the recesses, formed by the pairs of ridges, on the rear faces of the end flanges I23, I24, I 25, will serve as snugly fitting seats for the spring loops 92, 93, 94.

The procedure in assembling the lamp 40'with The hooks of the connector portions 5I, 52, 53 are brought into registry with the wider portions H of the compound apertures I01, I08, I09 in the lamp flange] and the hooks and flange are moved axially with respect to each other, against the bias of the contacts .11, 18, so that the ends of the'hooks pass through'the wider apertures IIO, whereupon the rear face of the flange 46, and more particularly, the axial projections I05, come into abutment with the front faces of the spring loops 92, 93, 94. The holding means 49 and the lamp 40 are now turned about their axes in such direction relativelyto each other that the beveled portions 63 of the hook lips engage the radial edges 3 of the larger aperture portions IIO of the compound apertures I01, I08, I09 of the lamp flange. The resulting cam action will pull the hooks further through the lamp flange 46,-against the bias of the biasing means 90. Continuance. of the relative rotative movement of the lamp 40 and'holding means 49 will cause the apexes83 of the lips'of the hooks to ride over the front faces of the radially extending portions 6, and

then the apexes 83 of the hook lips will'snap respectivelyjnto the smaller aperture portions III of the compound apertures I01, I08, I09 of the lamp flange. The lamp 40 and holding means 49 are now completely assembled and have the position shown in Figures 6 and 7. In that position the sides 59, 60 of the hook mouth strad- .dle the radial portion II6 of the lamp flange,

those sides being in contact with the edges H4, H3 respectively of the radial portion H6. The front face of the biasing means 90 of course is pressed toward the rear face of the flange 46.

The assembled lamp, 40, and holding means, 49, now constitute a unit which is adapted to be in turn assembled with the reflector 4 I as follows. The unitary lamp and holding means, shown assembled as a unit in Figures 6 and 7, are brought into axial alinement with the aperture H9 in the reflector M, with the bulb of the lamp 40 facing the rear of the reflector, the bulb of the lamp is passed through the reflector aperture H9, and the unit is rotationally so positioned that the sectoral projection I04 may be passed through the recess I20. In this position the sectoral projections I02, I03, I04 will of course be in a position to pass through the recesses I2I, I22, I20 respectively. The lamp and holding means unit is then moved axially toward the reflector until the front surfaces of the spring loops 92, 93, 94 abut the rear margin of the cylindrical portion II1. lamp and holding means unit is then moved still further axially, against the bias of the biasing means 90, until the rear face of the lamp flange 46 is in front of the front faces of the end flanges I23, I24, I25. The lamp and holding means unit 46 bear, in this instance, against the approximate circumferential centers of the-end flanges I23, I24, I25. The position of these parts is then as shown in Figures 1, 10, 11, and 12.

It will be evident that the biasing means 90 biases the shell 50 and the hooks of the connector portions 52, 53 rearwardly and consequently the hookspress the flange 46 toward the end flanges I23, I 24, I25. Since the lamp flange 46 is accurately pre-positioned with respect to its distance from the filaments 88, 89, and the direction of the planeof the flange 46 is prepositioned with respect to the axis of the lamp 40, and furthermore, since the spring loops 92, 93, 94, in cooperation with the pairs of ridges I26 accurately determine the position of the lamp v40 about its axis with respect to the reflector 4I',

the filament 88, and also the auxiliary filament 89, will be positioned at, the desired places with respect to the reflector. It will be noted, moreover, that the lamp flange 46 cannot be passed through the reflector upside down because the end flange I24 cannot be straddled by the sectoral projections I02, I04.

The flange 46 may be pre-positioned by assembling the lamp with the positioning means 43 and placing the positioning means 43 on a standard with the shell 44 within the collar 45 and then adjusting the lamp until the lighting center of the desired filament thereof is in a predetermined position, whereupon the collar 45 is soldered to the shell 44. 'The position of other filaments of Thethe lamp may be likewise simultaneously predetermined.

It will be noted that, since the axial projections I are unequally circumferentially spaced, and the spring loops are similarly spaced, the projections I05 might be pressed against the end flanges I23, I24, I25 with undesirably unequal force if .the spring loops were of equal strength. This inequality may desirably be equalized by making the spring loops 92, 94 each of less width, and therefore of less strength, than that of the spring loop 93.

When it is desired to disconnect a lamp 40 from the reflector H, the lamp 40 and holding means 49 are turned as a unit with respect to the reflector until one or the other of the projections I02, I04 on the lamp flange 46 is brought into registry with the recess I20, whereupon the lamp 40 and holding means 49 may be removed as a unit by axial movement with respect to the reflector.

The lamp 40 may be removed from the holding means 49 by turning the lamp about its axis in a counterclockwise direction, as viewed in Figure 6, wherebythe' edges II4 of the radial portions H6, by cam action against the sides 59 of the bottoms of the hook mouths, force the hooks frontwardly with respect to the biasing means 90, against the bias of the biasing means, thereby permitting disengagement of the lamp, as will be evident.

Referring 'now to the embodiment shown in Figures l3'through 24. In this embodiment an incandescent electric lamp 40a is also adapted to be connected to a mounting or reflector 4Ia. The lamp 40a is provided with a base 42a, which in this instance includes laterally extending positioning means 43a also forming part of the means for connecting the lamp to the reflector 4Ia. The base 42a includes a shell 44a, and the laterally extending portion of the base 42a comprises a collar 45a, surrounding the shell 44a, and a radially extending flange 48a on the collar. The collar 45a may be fastened to the shell 44a in any suitable manner, as by solder 41a (see Figure 1'1). The lamp flange 46a is adapted to be seated on the bottom of a rearwardly extending pocket 48a provided on the reflector Ma; and a holding means 49a, cooperating with the lamp flange 46a, is provided for holding the lamp 48a assembled with the holding means 49a and with the reflector 4Ia, as will more fully appear.

The holding means 49a comprises a shell 50a, desirably of generally cylindrical form, which may be seamless, and desirably formed of sheet metal. At its front end the shell 50a is provided with an annular radial flange I21, which carries a plurality of concentrically arranged unequally circumferentially spaced connector pins 5Ia, 52a, 53a, desirable three.

The connector pins 5 la, 52a, 53a, are all identical and therefore a detailed description of one of them will serve for all. An enlarged view of one of the connector pins is shown in Figure 24, as it appears before assembly with the holding means 49a. Each connector pin has a cylindrical shank I28, which before assembly with the flange is of uniform cross-section. At the front end each connector pin is provided with a head I29 having a cylindrical portion I3iI, the cylindrical portion being joined to the shank I28 by a frustroconical portion I3I. The free end of the head I28 is here shown as also provided with a frustroconical portion, I32. The connector pins 5Ia, 52a, 53a, may be hollow as indicated in Figure 24.

The shanks I28 of the pins 5Ia, 52a, 53a are snugly but slidably disposed through apertures I33 in the flange I 21, and are similarly disposed through registering apertures I34 in a biasing means I35, here shown as an annulus I38 of spring sheet metal having three radially outwardly extending ears I31, I38, I39. The lower ears I31, I39, as viewed in the drawings, are spaced somewhat more than 120 apart, and the upper ear, I38, is hereshown as so disposed that its axis of symmetry bisects the angle between the axes of symmetry of the lower ears I31, I38. The annulus I36 has a central aperture I40 which is here shown as of such diameter that when the biasing means I35 is slipped over the shell 50a toward the flange I21, the front margin of the aperture I40 will abut a fillet I4I joining the flange I21 and shell 58a, the biasing means I35 being consequently spaced somewhat from the rear face of the flange I21. The connector pins 5Ia, 52a. 53a may be held assembled with the flange l21 and the biasing means I35 by forming a lateral extension at the rear ends of the shanks I28, as by flaring out the free ends of the shanks to form the flared portions I42.

The shell 50a is here shown as carrying contacts 11a, 18a, constructed and arranged the same as the contacts 11, 18 of the embodiment of Figures 1 through 12, and associated with the shell 58a in the same manner as are the contacts 11, 18 with the shell 50, and hence requiring no further description. The contacts 11a, 18a are cooperable with-contacts 86a, 81a, carried by the lamp base 42a, and these contacts serve to electrically connect conductors 18a, 88a, to filaments 88a, 89a, as in the case of the embodiment of Figures 1 through 12, and hence also require no further description.

The lamp flange 46a comprises a portion "Ha I of generally circular outline, and a pluralityof radially extending sectoral projections I02a, I 83a, III4a, desirably three. The peripheral arcs of the sectoral projections 12a, I03a, I04a are here shown as equal, but the sectoral projections are circumferentially unequally spaced, the upper projections, I Ma, Ma, as viewed in the drawings, being less than 120 apart, and the lower projection I03a being so positioned that its axis of symmetry bisects the angle between the axes of symmetry of the upper projections III2a, IIl4a. Each sectoral projection Ha, I 0311, "Ma is here shown as being provided with an axially rear: wardly extending projection I 85a, conveniently formed by forming a depression 10611 in the front face of each sectoral projection, the projections.

Ill5a being here shown as located on the axes of symmetry of the sectoral projections.

-For cooperation with the connector pins 5Ia, 52a, 53a, the lamp flange 46a is providedwith three circumferentially spaced compound apertures IIl1a, I08a, I09a, unequally spaced to correspond to the unequal spacing of the connector pins. The compound apertures I 01a, I08a, IIi9a are here shown as disposed in the portion I0 Ia of the lamp flange. Each compound aperture I01a, "18a, I89a. comprises an arcuate smaller 02' seat portion I43, and an arcuate larger or entrance portion I44, oircumferentially spaced from the seat portion I43, the seat and entrance aperture portions being joined by a connecting portion I45 tapering from the entrance portion I44 to the seat portion I43. The margins of the connecting portion I45 are, in this instance, arcuate and generally tangent to the entrance portion I44, while the junction between the connecting portion I45 and the seat portion 1431s narrower than the diameter of the circle defined by the seat portion, thus forming humps I46 at the junction. The centers of. the seat portions I43 are here shown as on the respective radii intersecting the projections I05a The reflector pocket 48a has a cylindrical portion II1a and a plane bottom or end flange II8a which is fragmentary in form. The. end flange I I8a has a central aperture I I9a which is slightly larger than the circle defining the periphery of the portion I 0Ia of the lamp flange 46a. The end flange N80. is fragmentarily cut away to form radially extending recesses I20a, I2Ia, l22a. These recesses leave the end, flange II8a in the form of three flat segmental end flanges I23a, I24a, I25a, the front surfaces of which, at least, define a single plane. The upper recess, I20a, is slightly wider circumferentially than one of the sectoral projections I02a, I03a, I04a, of the lamp flange, and the end flanges I23a, I24a, I25a are of substantially the same circumferential width as the sectoral projections. Furthermore, the end flanges I23a, I24a, I25a are so positioned that in one relative rotative relation as between the lamp 40a and the reflector 4Ia, the sectoral projections I02a, I03a, I04aon the lampflange will register with the said end flanges. The diameter of the inner periphery of the cylindrical portion I I1a of the pocket is here shown as slightly larger than the diameter of the circle defining the outer peripheries of the sectoral projections I02a, I03a, I04a of the lamp flange, but the cylindrical portion of the pocket may gage, that is, snugly fit the outer peripheries of the sectoral projections, when the axial projections I05a are seated on the end flanges I23a, I244, I25a.

For cooperation with the ears I31, I38, I39 on the biasing means, the reflector 4Ia is provided with three axially rearwardly extending ears I41, I48, I49. The inner peripheries of the ears I41, I48, I49 are here shown as forming continuations of the cylindrical surface deflning the inner peripheral cylindrical surface of the portion I I1a of the reflector pocket. At their free ends the ears I41, I48, I49 are provided with axial recesses I50, the seats of which are of such width and position as to be complementary to the ears I31, I38, I39 of the biasing means, when the sectoral projections I02a, I03a, I040. on the lamp flange are in registry with the end flanges I23a, I24a, I250 of the pocket. The recesses I50 in the reflector ears are approached on both sides, from the rear faces of the end flanges I23a, I24a, I25a, by rearwardly inclined portions I5I, of the reflector ears, forming cam surfaces.

The lamp 40a may be assembled with the holding means 49a as follows. The entrance portions I44 of the compound apertures I01a, I08a, I09a are brought into registry with the heads I29 of the connector pins 5Ia, 52a, 53a, the lamp flange 46a. being slipped over the heads I29, against the bias of the spring pressed contacts 11a, 18a, until the rear face of the lamp flange is in contact with the front face of the flange I21. The lamp 40a is then rotated clockwise, as viewed in Figure 18, thereby causing interengagement of the margins of the. tapering portions I45 of the compound apertures I01a, 108a, IBM and the frustro-conical portions I3I of the heads I29 of the connector pins. Further clockwise rotation of the lamp 40a causes the frustro-conical portions I3I to pass the humps I46 and snap into the seat portions I43. The parts then have the position shown in Figures 18 and 19.

The assembled lamp 40a and ho d g means 49a now constitute a unit which is adapted to be in turn assembled with the reflector Ma. The unitary lamp and holding means are brought into axial alinement with the aperture H90. in the reflector, with the bulb facing the rear of the reflector, the unit is rotationally so positioned that the sectoral projections I02aj, I04a' will straddle the end flange I23a and the lamp is moved axially forward through the reflector aperture II9a, the sectoral projections I02a, I03a, I04a passing respectively through the recesses I2Ia, I22a, I20a, and the front faces of the ears.

I31, I38, I39 coming into contact with the rear faces of the end flanges I25a, I23a, I240. The unit is then moved frontward sufficiently, meanwhile flexing the biasing means I35, so that the sectoral projections I02a, I030, I04a will clear the end flanges I23a, I24a, I25a. The lamp and holding means unit is then rotated in a clockwise direction, as viewed from the rear of the reflector, thereby causing the ears I31, I38, I39 to engage the leading cam surfaces I5I, and further clockwise rotation causing these ears I31, I38, I39 to snap into the axial recesses I50 on the reflector ears I41, I48, I49. The parts then assume the position shown in Figures 13, 21, and 23, in which the axial projections I05a on the lamp flange 46a are in engagement with the front faces of the end flanges I23a, I24a, I25a and are held in that position by the bias of the biasing means I35.

It will be evident that since the lamp flange 46a is accurately pre-positioned with respect to its distance from the filaments 88a, 89a, and the direction of the plane of the flange 46a is prepositioned with respect to the axis of the lamp 40a, the filaments 88a, 89a will assume a desired predetermined position with respect to the reflector 4Ia when the parts are assembled as hereinbefore described. Also, it will be noted in the above connection that the ears I31, I38, I39 are interengageable with the recesses I50 in the reflector ears I41, I48, I49 in but one relative rotative relation.

It will be observed from Figures 18 and 21 that the ears I31, I38, I39 of the biasing means do not register with the sectoral projections, I02a, I03a, I04a, of the lamp flange'as do the spring loops 92, 93, 94 in the embodiment of Figures 1 through 12, but on the contrary,'are positioned circumferentially between the sectoral projections. The construction and arrangement of the biasing means I35 is in any event such that a desired suflicient equalization of. bias on the projections I05 is attained.

The method of disconnection of the parts is evident from the hereinbefore described method of assembly.

Referring now to the embodiment shown in Figures 25 through 35. In this embodiment an incandescent electric lamp 40b, is also adapted to be connected to a mounting or reflector, 4Ib. With the exception of the fact that the lamp 40b has a positioning means 43b the collar 45b of which extends frontwardly from the flange 46b, instead of rearwardly, the lamp 40b is identical with the lamp 40a. As in the previously described embodiments, the flange 46b is adapted to be seated on the bottom of a rearwardly extending pocket 48b provided on the reflector MD; and a holding means 491), cooperating with the lamp flange 48b is provided for holding the lamp 40b assembled with the holding means 4% and with the reflector Mb.

The holding means comprises a shell 50b, desirably of generally cylindrical form, which may Cal be seamless, and desirably formed of sheet metal. The shell 50b carries contacts 111), 18b, constructed and arranged, for cooperation with lamp contacts 86b, 81b, the same as the contacts 11, 10 and the contacts 86, 81 of the embodiment of Figures 1 through 12. The contacts 11b, 18b and 861), 81b serve to electrically connect conductors 19b, 801) to filaments 881), 89b, as in the case of the embodiment of Figures 1 through 12, and hence no further description is required.

At its front end the shell 501) is provided with a generally annular end flange I 52, which carries a plurality of concentrically arranged unequally circumferentially spaced connector pins Ib, 52b, 53b, desirably three. These connector pins 5Ib,

52b, 531) are all identical, and therefore a de-.

tailed description of one of them will serve for all. An enlarged view of one of the connector pins is shown in Figure 35, as it appears before assembly with the holding means 491). Each connector pin is here indicated as hollow and as having a cylindrical shank I53, which is closed at its free end I54, and, before assembly with the holding means 491), is of uniform cross-section. At the front end the pins are provided with heads I55 having a cylindrical portion I56, the cylindrical portion being joined to the shank I53 by a frustro-conical portion I51. The free end of the head I56 is here shown as provided with a rounded margin I58.

The shanks I53 of the pins 5Ib, 521), 53b are snugly but slidably disposed through apertures I59 in a biasing means I60. The biasing means I60 is shown in Figure 27, developed in a plane, as it appears before it is completely formed and assembled as a part of the holding means 49b. The biasing means I60 includes an annular part I6I having radially outwardly extending projections IBM, 5311, IBM, here shown as provided, in their slightly wider free ends, with bayonet type apertures each having a wider entrance portion I65 and a narrower seat portion I66. For cooperation with these bayonet type apertures the flange is provided with three T-shaped radial projections, the cross arm I61 of the T being adapted to pass through the wider aperture portion I65 of the bayonet type slots in the projections I62a, I63a, I64a, whereas the leg I68 of the T is adapted to fit in the seat portion I66. The T-shaped projections I61, I68 on the flange I52 are" here shown as extending radially from wider bases I69, themselves extending radially from the flange I52. 7

The biasing means I60 is provided with three frontwardly axially extending projections or .detents I10, here shown as 'of generally hemispherical form and conveniently formed by making depressions I1I in the opposite face of the biasing means. These detents are here shown as located near the outer margin of the portion I6I,. near the circumferentially counter clockwise side of the radially extending projections IBM, 5311, IBM.

The flange I52 is provided with three apertures I 12 adapted to snugly but slidably receive the shanks I53 of the connector pins 511), 52b, 53b. These apertures I 12, and the.apertures I59 in the biasing means I60, are adapted to be alined with each other. In order to assemble the biasing means I60 withthe flange I 52, the radially extending projections I62a, I63a, I64a, as shown in Figure 27, are bent radially inwardly to form spring loops I62, I63, I64, the ends I13 of which extend frontwardly in a generally axial direction. The biasing means I60 is then so related to the flange I52 that the set of apertures I59 is in alinement with the set of apertures I12. The larger portions I65 of the bayonet type slots are passed over the cross arms I61 of the T-shaped projections, to bring the seats I66 of the bayonet type slots against the front faces of the leg portions I68 of the T-shaped projections. The connector pins 5Ib, 52b, 53b may then be passed through the alined sets of. apertures I59 and, I12, to the position shown in Figure 29, in which. the small ends of the frustro-conical portions I 51 are in abutment with the margins of the apertures I59 in the annular portion I6I of the biasing means, and the annular portion I 6| has been moved somewhat toward the front face of the flange I52 to put the biasing means I60 under a predetermined stress. The free ends of the connector pins 5Ib, 521), 531) are then transversely locally squeezed or swedged to form laterally extending projections I14 which are adapted to engage the rear face of the flange I52, under the bias of the biasing means I60. The holding means 491) then has the appearance as shown in Figures 28 and 29.

The reflector pocket 481) has a cylindrical portion H11) and a plane bottom or end flange H81) which is fragmentary in form. The end flange H81) has a central aperture I I91) which is slightly larger than the circle defining the periphery of the portion I Nb of the lamp flange 461). The end flange I I81) is fragmentarily cut away to form radially extending recesses I201), I2Ib, I221). These recesses leave the end flange II8b in the form of three segmental end flanges I231); I24b, I251), the front surfaces of which, at least, de.- fine a single plane. The rear faces of the end flanges I23b, I241), I251) are flush with a plane defining the rear end of the cylindrical portion H11) of the reflector pocket. The end flanges I231), I201), Ib are of such width and position as to be reglstrable with the sectoral projections I02b, I031), I041).

Each end flange is provided with a recess or aperture I15, these apertures I15 being so located in the end flanges as to be complementary to the hemispherical detents I10 when the sectoral projections I021), I03b, I041) of the lamp 401) are in alinement or registry with the end flanges I231), I241), I251) of the reflector pocket.

The lamp 401) may be assembled with the hold ing means 49b by cooperation between the compound apertures I011), I081), I091) and the connector pins 5Ib, 52b, 53b of the holding means 691) in exactly the same manner as has already been described in connection with the lamp a and the holding means 49a of the embodiment of Figures 13 through 24. The parts then have the position shown in Figures 30 and 31. The biasing means I60 acts to press the seat portions I43b of the compound apertures I011), 108b, I091) firmly against the frustro-co-nical portions I51 of the connector pins 5Ib, 52b, 53b.

The assembled lamp, 401), and holding means, 491), now constitute a unit which is adapted to be in turn assembled with the reflector M1). The u'nitary lamp and holding means are brought into axial alinement with the aperture H91) in the reflector, with the bulb facing the rear of the reflector, the unit is rotationally so positioned that the sectoral projections I021), I041) will straddle the end flange I231) and the lamp is moved axially forward through the reflector aperture H91), the sectoral projections 1%, I031), I041) passing respectively through the recesses I2I1), I221), I201), and the front face of the annular portion I6I coming into contact with the rear end face of the reflector pocket 48b. The unit is then moved frontwardly s'ufliciently, meanwhile flexing the spring loops I62, I63, I64, so that the sectoral projections I021), I031), I041) will clear the end flanges I23b, I24b, I251). The lamp and'holding means unit are then rotated in a clockwise direction, as viewed from the rear of the reflector, the hemispherical detents I10 meanwhile being cammed rearwardly by the leading margins of the end flanges I231), I241), I251) of the reflector pocket, continued clockwise rotation eventually causing the hemispherical detents I10 to snap into the apertures I15 in the end flanges. The parts then assume the position shown in Figures 25, 33, and 34, in which the axial projections I051) on the lamp flange 46b are in engagement with the front faces of the end flanges I231), I241), I251), and are held in that position by the bias of the biasing means I60.

It will be noted that when the parts are assembled, the connector pins Ib, 52b, 53b, and the set of axial projections I05b, and the spring loops I62, I63, I64 are respectively in radial alinement and hence, due to the unequal circumferential spacing of these parts, it may be desirable to make the spring loops I64, I64 each narrower than the spring loop I62, if equalization of pressure on the projections I05bis desired.

It will be evident that since the lamp flange 46b is accurately pre-positioned with respect to its distance from the filaments 88b, 89b, and the direction of the plane of the flange is pre-positioned with respect to the axis of the lamp, the

filaments will assume a desired predetermined position with respect to the reflector 4Ib when the parts are assembledas hereinbefore described. Also, in this connection, it will be noted that the detents I are interengageable with the apertures I in the end flanges in but one relative rotative relation.

Referring now to the embodiment shown in Figures 36 through 38. In this embodiment an incandescent electric lamp 400 is adapted to be connected to a mounting or reflector 4Ic. The lamp 400 is provided-with a base 420, which in this instance includes laterally extending positioning means 430 also forming part of the means for connecting the lamp to the reflector 4 I0. The lamp 400 is here shown as identical with the lamp 40a of the embodiment of Figure 13, and accordingly the positioning means 430 corresponds to the positioning means 43a of the lamp 40a, and the flange 460 is adapted to be seated on the bottom of a rearwardly extending pocket 48c pro- .vided on the reflector M0; and a holding means 490 cooperating with the lamp flange 460, is adapted to hold the lamp 400 assembled with the holding means 490 and with the reflector Me, as will more fully appear.

The holding means comprises a shell 500, and, similarly to the shell 5011, the shell is provided at its front end with an annular radial flange I210, which carries a plurality of concentrically arranged unequally circumferentially spaced connector pins 5Ic, 52c, 53c, desirably three. The connector pins 5Ic, 520, 530 have heads I55c similar to the heads I55 of the connector pins 5Ib, 52b, 53b of the embodiment of Figures 25 through 35, and accordingly no further description of the heads is necessary. However, in this instance the connector pins 5Ic, 520, 530 are shown as solid and as having shanks I530 provided with reduced ends I11 fitting in apertures I18 in the radial flange I210. The reduced ends I11 are fixed to the radial flange I210 by riveting as at I19. The shanks I530 of the pins 5Ic, 52c, 530 are snugly but slidably disposed through registering apertures I34c in a biasing means I350, here shown as including an annulus I360 of spring sheet metal having three radially outwardly extending ears I310, I380, I390, the ears being disposed similarly to the ears I31, I38, I39 of the biasing means I35 of the embodiment of Figure 13, but are here shown as somewhat narrower oircumferentially and somewhat longer radially. In addition, the ears I310, I380, I390 are normally offset rearwardly out of the general plane of the annulus I360, as may be seen particularly in Figure 3'1. The central aperture I400 of the annulus I360 is made of sufficient diameter so that it will clear the collar 450 of the positioning means 430. It will of course be evident that in the present embodiment the biasing means I350 will be assembled with the shanks I530 of the connector pins 5Ic, 520, 530 before the connector pins are riveted to the radial flange I210.

The rear end of the shell 500 is here shown as carrying an insulating member 660 which in turn carries spring pressed contacts 110, 18c, the construction and arrangement of these parts being here shown as identical with the construction and arrangement of the similar parts in the embodiment of Figure 1, and requiring no further description.

It will be evident that by bringing the compound apertures in the flange 460 of the lamp c into registry with the heads of the connector pins 5Ic, 52c, 53c, and moving the lamp axially against the bias of the spring pressed contacts 110, 18c, and then rotating the lamp clockwise, as viewed from the front thereof, to bring the frustro-conical portions I510 of the connector pins onto the seat portions I430 of the compound apertures, the lamp may be assembled with the holding means 490 and the parts will then have the appearance in side elevation as shown in Figure 37.

The reflector He may be identical with the reflector Me of the embodiment of Figure 13, (the reflector 4Ia being shown in perspective in Figure 22), with the exception that the seats I500 (corresponding to the seats I50) will be made narrower, if, as shown in Figure 38, the ears I31c, I38c, I390 are narrower circumferentially than the ears I31, I38, I39.

It will be obvious from the foregoing that the assembled lamp 400 and holding means 490 may be assembled with the reflector Me in a manner analogous to that already described in connection with the lamp 4011, holding means 49a, and reflector Me of the embodiment of Figure 13, it being noted, however, that in this instance when the parts are brought to the assembled position, shown in Figure 36, the annulus I360 of the biasing means I350, by reason of its location frontwardly of the radial flange I210, will re-act rearwardly against the front face of the radial flange I210, whereas in the embodiment of Figure 13 the annulus I36 of the biasing means I35 reacts rearwardly against the flared portions I42 of the pins 5Ia, 52a, 53a. Thus, in the embodiment of Figure 36, the biasing means not only biases the connector pins rearwardly but also the shell 500.

It will be evident that when the parts are in either'the position of Figure 37 or Figure 36, the spring pressed contacts 110, 180 on the holding means 49c will be in cooperative relation with the contacts 86c, 810 on the lamp base 42c and thus current may be supplied to the filaments (not shown) of the lamp 400, as already pointed out in connection with the previous embodiments.

It will be evident that, for reasons analogous to those stated in connection with the previous embodiments, the filaments of the lamp 40c will assume the desired predetermined position with respect to the reflector 4 I0 when the parts are in the assembled position of Figure 36.

Referring now to the embodiment shown in Figures 39 through 41. In this embodiment an incandescent electric lamp 4011 is adapted to be connected to a mounting or reflector Md. In this embodiment the lamp 40d is identical with the lamp 40:; used in the embodiment of Figure 13, and is cooperable with a reflector identical with the reflector Me of the embodiment of Figure 36. Here too the lamp flange lid is adapted to be seated on the bottom of a rearwardly extending pocket 4801 provided on the reflector Md,

and a holding means #911, cooperating with the lamp flange 46d, is provided for holding the lamp 40d assembled with the holding means 48d an with the reflector Md.

The holding means 49d includes a shell 5041, similar to the shell 50a of the embodiment of Figure 13, provided with a radial flange I80 at its front end, but in this instance the radial flange I80 is provided with three radially extending unequally circumferentially spaced resilient ears I81, I 82, I83, so that, in front elevation, as shown in Figure 41, the flange I80 with the ears I 8|, I 82, I83 appears similar to the biasing means I350 oi the embodiment of Figures 36 through 38. The ears I8I, I82, I83 are normally slightly offset rearwardly from the general plane of the radial flange I80, as may be seen best in Figure 40. The radial flange I80 is here shown as carrying three connector pins 5Id, 52d, 53d, unequally circumferentially spaced to correspond to the spacing of the compound apertures in the lamp flange 46d. The connector pins 5Id. 52d, 53d are here shown as identical with the connector pins 5Ic, 52c, 53c'of the embodiment of Figures 36 through 38 and are accordingly fixedly mounted on the flange I80 by riveting.

The shell 50d carries at its rear end an insulating member 66d which in turn carries spring pressed contacts 11d, 18d, these parts being here shown as constructed and arranged identically with the corresponding parts of the embodiment of Figure 1. I

It will be obvious that when it is desired to assemble the lamp 4011 with the holding means 48d the compound apertures of the lamp flange 46d are brought into registry with the heads of the connector pins 5Id, 5211,5311, the lamp being moved axially against the bias of the spring pressed contacts 11d, 18d and then rotated in a'clockwise direction, as viewed from the front, the parts being then in the position shown in Figure 40, in which thespring pressed contacts 11d, 18d act to press the frustro-conical portions I51d of the pins against the seat portions I43d of the compound apertures of the lamp flange 4601.

The lamp 40d and holding means 48d having been assembled, they may be assembled with the reflector Md in a manner which is obvious from what has already been stated in connection with the embodiments of Figures 13 and 36, thus bringing the parts to the position shown in Figure 39.

in which the filaments (not shown) of the lamp 40d are in the desired predetermined relation with respect to the reflector Md. In both the position of the parts shown in Figure 39 and Figure 40, the spring pressed contacts 11d, 18d are in cooperative relation with the lamp contacts 86d, 81d.

Referring now to the embodiment shown in Figures 42 through 46. In this embodiment an incandescent electric lamp Me is adapted to be connected to a mounting or reflector Me. The lamp 40c is provided with a base 42c which includes laterally extending positioning means 43c also forming part of the means for connecting the lamp to the reflector Me. The laterally extending portion of the base comprises a collar 45c, surrounding the shell 44c, and a radial extending flange 06c on the collar 45c, which in this instance extends from the rear end of the collar 45a. The lamp flange Mie is identical with the lamp flange 46a shown in Figure 17, and is adapted to be seated on the bottom of the rearwardly extending pocket 48c provided on the reflector Me; and a holding means 9e, cooperating with the lamp flange 46a, is provided for holding the lamp 40c assembled with the holding means 49c and with the reflector Me, as will more fully appear.

The holding means comprises a shell 50c, which in this instance is of somewhat smaller diameter than the shell 50a of the embodiment of Figure 13, but sufliciently large to permit reception of the shell Me of the lamp base. At its front end the shell 50c is provided with an annular radial flange I84 provided with three unequally circumferentially spaced radially extending resilient ears I85, I86, I81. The ears I86, I81 are here shown as less than 120 apart, and the axis of symmetry of the ear I85 as bisecting the angle between the axes of symmetry of the ears I86, I81. The ears I85, I86, I81 are here shown as offset, at their radially inner ends, rearwardly from the general plane of the radial flange I84, but the ears as a whole are each normally inclined frontwardly, as may be best seen in Figure 43, when the holding means 49c and lamp 40c are disassembled from the reflector Me. The ears I85, I86, I81 are provided with frontwardly extending dome shaped projections or detents I88, conveniently formed by making indentations I89 in the rear faces of the ears.

The holding means 48c carries a plurality of concentrically arranged unequally circumferentially spaced connector pins 5Ie, 52c, 53c, for

cooperation with the compound apertures of the lamp flange 468. These connector pins 5Ie, 52c, 53c are identical with the connector pins 5Ic, 52c, 580 of the embodiment of Figure 36, for example, with the exception that the shanks I53e of the pins are shorter. It will be noted that the connector pins 5Ie, 52c, 53c are here shown as mounted on the radial flange I84 in a position displaced clockwise from the radial axes of symmetryof the ears I85, I86, I81.

At its rear end the holding means 48c carries an insulating member Elie which in turn carries spring pressed contacts 118, 18c, the construction and arrangement of these parts being here shown as identical with that of the corresponding parts of Figure 1.

It will be evident that when it is desired to assemble the lamp 40c with the holding means He, the compound apertures of the lamp flange 46s are brought into registry with the heads of the connector pins 5Ie, 52c, 53c, the lamp being moved axially against the bias of the spring pressed contacts 11c, 18c and then turned in a clockwise direction, as viewed from the front, to a position in which the frusto-conical portions I512 of the heads of the pins are seated in the seat position shown in Figure 43. In this position of the parts the detents I88 resiliently bear, to a desired extent, against the rear face of the lamp flange 46e.

The reflector Me is here shown as identical with the reflector 41b of the embodiment of Figure 25 shown in detail in Figure 32, with the exception that the apertures I 15e are located slightly differently from the apertures 115, for proper cooperationwith the detents I88.

It will accordingly be evident that after the lamp 40c and holding means 49e have been assembled with each other, they-may be assembled with the reflector Me in a manner anologous to that already described in connection with the embodiment of Figure 25, it being noted that in this instance, as the sectoral projections I02e, I03e, I04e of the lamp flange 46c are passed through the recesses I2Ie, I22e, I 20e respectively, the ears I85, I86, I81 will bear against the rear end surface of the cylindrical portion II1e of the reflector pocket 48c, the ears I85, I86, I81 being flexed rearwardly as the lamp is pushed axially frontwardly during the assembling oper-- ation. After the lamp flange 46e has been passed through the reflector, the assembled lamp and holding means are rotated in a clockwise direction, asviewed from the rear of the reflector, the detents I88 riding up onto the rearfaces of the end flanges I23e, I24e, I25e, continued rotation causing the detents to snap into the seats formed by the apertures I15e,' the parts being then in the position shown in Figures 42, 45, and 46.

It will be evident from the foregoing that when the parts are in this assembled position the filaments 88c, 89c of the lamp We will be in the means 43f includes a radially extending flange 46 at the rear end of a collar 45 surrounding the lamp base shell 44f, the flange 46f being identical with the flange 46a of the lamp of the embodiment of Figure 13, shown in detail in Figure 1'7, with the exception that the compound apertures I01), I08 I09f of the lamp flange 46f, instead of having their seat portions I43 disposed in radial alinement with the axial projections I (as is in the case of the seat portions I43, with respect to the projections I05), they have their seat portions I43,f disposed a predetermined amount counter clockwise from the radii defining the axial projections I05f.

The holding means 49f includes a cylindrical shell 50 of a size such as described in the embodiment of Figure 42, and at the-front end of in turn provided at their ends with circumferentially extending resilient arms I94, here shown as of equal length. The circle defining. the peripheral margins of the arms I94 is here shown 1 as equal in diameter to the circle defining the ly extending dome shaped projections or detents I95 conveniently formed by making indentations I96 in the rear faces of the arms. Owing to their relation to the projections I9I, I92, I93, the detents I95 are unequally circumferentially spaced. The radial projections I9I, I92, I93 on the annular flange I90 are here shown as carrying three connector pins 5If, 52 53!, these connector pins being of thesame form as the connector pins 5Ic, 52c, 53c of the embodiment of Figure 36,. and they are likewise rigidly fastened to the radial projections I9I, I92, I93. The circumferential arrangement of the connector pins 5|), 52], 53 is of course such that they are cooperable with the compound apertures in the lamp flange 46L, Owing to the illustrated relationship of the parts in this embodiment, the connector pins SH, 52 53), while similar to the pins 5Ic, 52c, 530 of the embodiment of Figure 36, have longer shanks, I53).

The holding means 49 carries at its rear end an insulating member 66 in turn carrying spring against the bias of the spring pressed contacts 11 18) and against the bias of the resilient arms I94, and then rotated clockwise, as viewed from the front, until the frustrb-conical portions I51) of the heads of the pins become seated on the seat portions I43 of the compound apertures. The parts then have the position shown in Figure 48, in which the detents I95 bear against the rear faces of the sectoral projections I02f, I03 I04 of the flange 46f.

x The reflector Mi is identical with the reflector of the embodiment of Figure 25, shown in detail in Figure 32, with the exception of a slightly different positioning of the apertures I15j (corresponding to the apertures I15) which are prospring arms I94 will bear against the rear faces of the end flanges I23), I24), I25f of the reflector as the assembled lamp and holding means are moved axially frontwardly, the arms being flexed. Rotation of the assembled lamp andholding means, in a clockwise direction as viewed from the rear of the reflector causes the detents to ride onto the rear faces of the end flanges I23 I24 I25 and continued rotation causes the detents I95 to snap into the apertures I15 bring-.

ing the'parts to the position shown in Figures 47, 51, and'52.

It will be evident that when the parts are in this assembled position the filaments (not shown) of the lamp40 will be at the desired predetermined position with respect to the reflector.

With respect to all of the embodiments hereinbefore described, while the preferred inode of assembly is as has been set forth, that is, by first assembling the lamp and holding means and then assembling the assembled lamp and holding means with the reflector, it will be apparent that the lamp and holding means need not be first assembled with each other but the lamp may be positioned at the front of the reflector'and the holding means at the rear thereof and then the connector pins of the'holding means connected to the lamp flange, as will be obvious, to bring the lamp and reflector and holding means to the same finally assembled position, as already described in connection with each embodiment.

From the foregoing it will be apparent to those skilled in the art that the illustrated embodiments of my invention provide new and improved electric lighting devices and units, readily and conveniently constructed and assembled, and accordingly, accomplish the principal object of my invention. On the other hand, it also will be obvious to those skilled in the art that the illustrated embodiments of my invention may be variously changed and modified, or features thereof, singly or collectively, embodied in other combinations than those illustrated, without departing from the spirit of my invention, or sacrificing all of the advantages thereof, and that accordingly, the disclosure herein is illustrative only, and my invention is not limited thereto.

I claim:

1. In combination: a mounting having an aperture; a plurality of projections extending radially inwardly from the margin of said aperture; an incandescent electric lamp having base-means provided with a lateral extension constructed and arranged to abut said projections, said lateral extension having a plurality of apertures; and holding means, having parts extending through said apertures in said lateral extension and engaging said lateral extension, said engaging parts being disposed radially inside of the locus of the radially inner margins of said projections, said holding means being constructed and arranged to press, said lateral extension against said mounting.

2. In combination: a mounting having an aperture; a plurality of projections extending radially inwardly from the margin of saidaperture; an incandescent electric lamp having base-means provided with a lateral extension constructed and arranged to abut said projections; and holding means, having parts extending in a direction transversely of said lateral extension engaging said lateral extension, said engaging parts being disposed radially inside of the locusof the radially inner margins of said projections, said holding means being constructed and arranged to press said lateral extension against said mounting.

3. In combination: a mounting having an ap erture; a plurality of projections extending radially inwardly from the margin of said aperture; an incandescent electric lamp having base-means provided with a lateral extension comprising a plurality of circumferentially spaced radially outwardly extending projections abutting said mounting projections; holding means, having parts engaging said lateral extension, said parts being radially within the locus of the radially inner margins of said mounting projections, constructed and arranged to press said lateral extension against said mounting; and said lat-- eral extension being so constructed and arranged with respect to said aperture that said outward projections may be inserted through the spaces s between said mounting projections and rotated, while said engaging parts are in engagement with said lateral extension, to bring said outward projections into abutment with said mounting projections.

4. In combination: a mounting having an aperture; a plurality of projections extending radially inwardly from the margin of said aperture; an incandescent electric lamp having base-means provided with a lateral extension comprising a plurality of circumferentially spaced radially outwardly extending projections abutting said mounting projections; said lateral extension havinga plurality of circumferentially spaced apertures; holding means, having parts engagl5 ing said lateral extension, said parts extending through said apertures in said lateral extension and being radially within the locus of the radially inner margins of said mounting projections,

constructed and arranged to press said lateral extension against said mounting; and said lateral extension being so constructed and arranged with respect to said aperture that said outward projections may be inserted through the spaces between said mounting projections and rotated,

while said engaging parts are in engagement with said lateral extension, to bring said outward projections into abutment with said mounting projections.

5. In combination: a mounting having an aperture; a plurality of projections extending radiallyinwardly from the margin of said aperture; an incandescent electric lamp having base-means provided with a lateral extension constructed and arranged to abut said projections; said lamp having contact means; and holding means carrying contact means cooperable with said lamp contact means, said holding means having parts engaging said lateral extension, said parts being disposed radially inside of the locus of the radially inner margins of said projections; said holding means being constructed and arranged through the intermediation of said engagiri'g parts to press said lateral extension against said mounting.

6. In combination: a mounting; an incandescent' electric lamp having a bulb provided with a base having a lateral extension, said base having contact means; said mounting having an aperture of sufficient size to permit passage of said bulb, and said lateral extension abutting said mounting radially outside of said aperture; said lateral extension having a plurality of aperatures; removable contact means cooperable with said lamp base contact means; and holding means, including connector portions extending through said "apertures in said lateral extension, constructed and arranged to hold said lateral extension in abutment with said mounting and to hold said removable contact means said lateral extension having a plurality of apertures;

holding means for receiving and holding said lamp separately from said mounting means; said lamp and said holding means comprising cooperating connecting means including connector portions extending through said apertures in 

